Cutter-head.



A. B. LANDIS. CUTTER HEAD.

APPLICATION FILED HA8. 5. 1M2- L2323579. I Patented July 10, 1917.

3 SHEETS-SHEET A. B. LANDlS.

CUTTER HEAD.

APPLICATION FILED MAR. 5. 1912- Patented July 10, 1917. Y

3 SHEETS-SHEET 2- A. B. LANDIS.

CUTTER HEAD. APPLICATION FILED MAR. 5. 19m;

Patented July 10, 1917. 3 SHIETS-SHEET 3 1 Fig.4,

ABRAHAM B. LANDIS, F ENEIELD, PENNSYLVANIA.

CUTTER-HEAD.

Specification of Letters Patent.

Patented July MD, 1%17.

Application filed March 5, 1912. serial No. 6$1,730.

7 '0 all whom it may concern:

Be it known that I, ABRAHAM B. L AND1s, a citizen of the United States, residing at Enficld, Montgomery county, and State of Pennsylvania, have invented and discovered certain new and useful Improvements in Cutter-Heads lof which the following is a specification. v

My said invention consists in various improvements in the details of construction and arrangement of parts of cutter-holders, whereby a head is provided which is rigid and compact and one that is easily adjusted and operated, all as will hereinafter be more fully described and claimed.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts, 1

Figure 1 is a front elevation ofa cutter head embodying my said invention,

Fig. 2 a central section through the same on the dotted line 2-2 in Fig. 1,

Fig. 3 a front elevation of the body of the head with the other parts removed,

Fig. -l a side elevation of Fig. 3,

Fig. 5, a detail View on the dotted line 5-5 in Fig. 1, the parts being in the position they occupy when the die is open,

Fig. 6 a view similar to Fig 5, but showing certain other parts in section and also showing the parts in the positions they occupy when the die is closed,

Fig. 7 a detail section through one side of the cutter-holder on the dotted line 7-7 in Fig. 8,

Fig. 8 an end View of said cutter-holder,

Fig. 9 an end View showing the cutterholder in position on its supporting base, the cutter being omitted,

Fig. 10 a side elevation of the same,

Fig. 11 a face elevation of the same, and,

Fig. 12 a of Fig.1 showing the parts adjusted for a left hand die.

In said drawings the portions marked A represent the body of the head, B a sliding ring mounted on said body, C a ring adjustably connected with said ring B and D the base for supporting the cutter-holder.

The body A is a casting of suitable form adapted to be attached to the spindle or turret of the machine and is formed with grooves ain its face which extend entirely across from edge to edge thereof intersecting each other at right angles and equi-disdetail view similar to a portion tant from the axis describing a square around said axis. Said grooves are preferably IF-shaped as best shown in Fig. 4.

The ring B is mounted upon body A and surrounds the same for substantially its entire length. It is formed with a circumferential groove 6 for engagement with a shifting fork (not shown) by which said ring may he slid longitudinally on said body for a limited distance. Said ring B is preferably formed in two parts, both for convenience in assembling and also to permit the two parts to be adjusted circumferentially in relation to each other for adapting the head for right or left hand work. Said two parts are formed with an interengaging joint and secured together by a screw, or .a number of screws, 6 as best shown in Fig. 2. The ring C is mounted on ring B and held thereto by means of a screw 10 mounted in a tangential socket in said ring C and engag-' ing with a thread in the adjacent surface of the ring B. Said ring C abuts against a shoulder or flange on ring B, as best shown in Fig. 2. Said ring C is formed with a groove 0 in its interior face, the bottom of which groove comprises a series of cam faces for a purpose to be presently described.

The base blocks D are formed with T- shaped heads d adapted to slide within the T-shaped grooves a of the body. Each of said base blocks is formed with dovetailed shaped shoulders to receive and support the cutter-holders D On the back of each base block D is journaled a roller 15 directly in a radial'line with the operative point of the cutter and said roller is adapted to bear against a sliding plunger 16 mounted in a cylinder 18 which, in turn, is mounted in a. radial socket formed in a boss 9 on the inside of ring B within ring C. Each cylinder 18 has a wing 17 which extends into groove 0 and bears against one of the cam surfaces therein. Each of said cylinders is perforated and a plunger 16 is. mounted therein, the inner end of which is formed with a double tapered face as best shown in Figs. 5 and 6 and the outer end of which is formed with a single transverse taper. A transverse screw 19 with a conical inner end is adapted to bear against the tapered outer end of said plunger 16 and serves as a means for adjusting each of said plungers independently of the others. The operation of screw 10 will turn ring C in relation to rin ate to adjust the several sli 'ng cylinders B, and oper- 18 simultaneously for the purpose of changing the die from one size work to the other. The adjustment through the medium of screw 19 is for the purpose of securing a uniform adjustment of the several cylinders and plungers, or to change the adjustment of each to make it-conform to the adjustment of the others. Each of the base blocks D has a perforation d in the part which extends through the narrow portion of the grooves or ways a, in which a coiled spring 40 is mounted which is adapted to bear against the adjacent side of the block extending at right angles therewith, said springs serve to normally hold said blocks to the limit of the outward movement. A ring 20 is mounted around the inner end of body A and covers the outer or" open ends of the grooves a, and protects said grooves from grit, dirt or other foreign substances. The rollers 15 are preferably mounted, as best shown in Fig. 6, so that they may roll in one direction only. For this purpose a ball is mounted on top of a spring 31 in a socket adjacent to the appropriate side of said roller said ball serving to lock said roller against rotation in one direction. Thus, when ring B is slid outwardly. and the plunger 17 passes from the position shown in Fig. 5 on one side of roller 15 to the position shown in Fig. 6 on the top of said roller, the point of said plunger will drag over the surface of the roller and wipe off any grit or foreign substances that may be on said surface and secure a perfect contact and guard against disturbing the proper adjustment between the several parts. In moving in the reverse direction the roller will turn and permit the movement to bevmade with little effort.

Each of the cutter-holders D is formed with a flange 21 having a cut-under tapered face with which a correspondingly tapered edge on the back ofthe cutter D engages. A cam roller 22 engages with a tapered edge on the opposite side of said cutter and holds it in position. Said cam roller 22 is operated in one direction to release the cutter by means of a lever 23 and in the opposite direction to clamp said cutter by means of a coiled spring 24 mounted in a longitudinal perforation in the roller, one end of said spring being inserted in a perforation 25 at one end of the socket in the holder D and the other end being inserted in a perforation at the bottom of the perforation in said roller. Said cutter-holders D are clamped in position in the base blocks D by means of a clamping pin 27 (see dotted lines in Fig. 2) having a dovetailed shaped point engaging under a correspondingly shaped flange'on the back of said holder D Said -clamping pin 27 is operated by a screw 28 with a conical point engaging in a conical recess in the side of said pin. The flange with which the point of said pin 27 engages is formed on the back of holder D on a curve as indicated most clearly in the lower'part of Fi 2, so that said cutters may be swung at di erent angles to provide for forming threads of different angles in the work.

When it is desired to change the hea from a right-hand head, as shown in the principal views to a left-hand head as shown in Fig. 12, the screws 6 are removed and the forward section of ring B carrying the plungers 16, is turned on the rear sectlon a sufficient distance to bring said'plungers to positions on the opposite side of the axis of the head, corresponding to those which they occupied in the right-hand arrangement. The screws 12 are then inserted in another set of perforations in the inner flange properly located, left-hand cutter holders put in place, and the head is thus converted as shown in Fig. 12, for left-hand work.

In operation, at the finish of each cut, body A carrying the cutter-holders and-ring B carrying plungers 16 are shifted longitudinally in relation to each other from the position shown in Fig. 6 to that shown in Fig. 5, permitting spr ngs 40, interposed between the side of one base and the end of the adjacent base, to expand and open the die. The parts are returned to closed position by means of a shifting fork, not shown, as will be readily understood.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is

1. A cutter-head comprising a body, a ring mounted to slide longitudinally on said body, cutter-holders mounted to slide in grooves which intersect and extend tangentially across the face of said body, means located in said grooves for holding said cutter-holders outwardly, and parts adapted to cooperate with bearing parts carried by said cutter-holders for forcing them inwardly, substantially as set forth.

2. A cutter-head comprising a body with tangential waysformed in the. face of the said body, cutter-holders mounted to slide in said ways, a ring mounted to have a limited longitudinal movement on said body, radially mounted supports on the inner side of said ring formed with inclined faces, bearings carried by said cutter-holders adapted to rest against said supports carried by said ring, and means for moving said ring longitudinally to carry said inclined faces over the cutter-holder bearings, substantially as ter-holders outwardly, bearings carried on the outer ends of said cutter-holders, a ring mounted to slide longitudinally on said.

body, cams carried by said ring and adapted to serve as rests for the bearings carried by the cutter-holders, and means for sliding said ring, substantially as set forth.

4. A cutter-head comprising a body, outter-holders mounted to slide tangentially across the face of said body, a ring mounted to slide longitudinally on said body, radially positioned bearings between said ring and said cutter-holders formed with inclined faces, and means for adjusting said bear-in s radially to regulate the size of the die, su stantially as set forth.

5. A cutter-head comprising a body, cutter-holders mounted to move in grooves which extend tangentially thereon, springs in said grooves for normally holding said cutter-holders outwardly, a ring mounted on said body carrying radially adjustable supports for said cutter-holders, a second ring mounted on said first ring carrying a series of cams against which said radially adjustable supports abut, means for adjusting said second ring circumferentially in re-, lation to said first ring to adjust said rests, and means for sliding said first ring longitudinally for opening and closing the die, substantially as set forth.

6. A cutter-head comprising a body formed with ways extending at right angles with each other across its face, cutterholders mounted to slide in said ways, means for sliding said cutter-holders outwardly,

I roller bearings mounted on theouter end of each cutter-holder, a sliding ring mounted on said body, radial supports with tapered inner ends mounted in said ring and adapted to contact with said roller bearings and means for sliding said ring, substantially as set forth.

,7. A cutter-head comprising a body, outter-holders mounted to slide across the face of said body, roller bearings mounted on the outer ends of said cutter-holders, a sliding ring mounted on said body, radially adjustable cylinders mounted in sockets in said ring, means for adjusting the several cylinders simultaneously, and plungers With tapered inner ends mounted in said cylinders and adapted to bear upon said roller bearings of the cutter-holders, substantially as set forth.

8. A cutter head comprising a body, out ter holders mounted to slide across the face of said body, means for sliding said cutter holders in an outward direction, a ring mounted to slide on said body, supports carried by said ring and extending inwardly to contact with said cutter-holders and formed with tapered inner ends, and means for adjusting each of said bearings independently and the several bearings simultaneously, substantially as set forth. I

In Witness whereof, I have hereunto set my hand and seal at Washington, D. (1., this 16th day of Feburary, A.-D. nineteen hundred and twelve.

ABRAHAM B. LANDIS. [n s.]

Witnesses:

E. W. BRADFORD, CHAS. N. LEONARD. 

